source: trip-planner-front/node_modules/ecc-jsbn/index.js@ 1ad8e64

Last change on this file since 1ad8e64 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.8 KB
Line 
1var crypto = require("crypto");
2var BigInteger = require("jsbn").BigInteger;
3var ECPointFp = require("./lib/ec.js").ECPointFp;
4var Buffer = require("safer-buffer").Buffer;
5exports.ECCurves = require("./lib/sec.js");
6
7// zero prepad
8function unstupid(hex,len)
9{
10 return (hex.length >= len) ? hex : unstupid("0"+hex,len);
11}
12
13exports.ECKey = function(curve, key, isPublic)
14{
15 var priv;
16 var c = curve();
17 var n = c.getN();
18 var bytes = Math.floor(n.bitLength()/8);
19
20 if(key)
21 {
22 if(isPublic)
23 {
24 var curve = c.getCurve();
25// var x = key.slice(1,bytes+1); // skip the 04 for uncompressed format
26// var y = key.slice(bytes+1);
27// this.P = new ECPointFp(curve,
28// curve.fromBigInteger(new BigInteger(x.toString("hex"), 16)),
29// curve.fromBigInteger(new BigInteger(y.toString("hex"), 16)));
30 this.P = curve.decodePointHex(key.toString("hex"));
31 }else{
32 if(key.length != bytes) return false;
33 priv = new BigInteger(key.toString("hex"), 16);
34 }
35 }else{
36 var n1 = n.subtract(BigInteger.ONE);
37 var r = new BigInteger(crypto.randomBytes(n.bitLength()));
38 priv = r.mod(n1).add(BigInteger.ONE);
39 this.P = c.getG().multiply(priv);
40 }
41 if(this.P)
42 {
43// var pubhex = unstupid(this.P.getX().toBigInteger().toString(16),bytes*2)+unstupid(this.P.getY().toBigInteger().toString(16),bytes*2);
44// this.PublicKey = Buffer.from("04"+pubhex,"hex");
45 this.PublicKey = Buffer.from(c.getCurve().encodeCompressedPointHex(this.P),"hex");
46 }
47 if(priv)
48 {
49 this.PrivateKey = Buffer.from(unstupid(priv.toString(16),bytes*2),"hex");
50 this.deriveSharedSecret = function(key)
51 {
52 if(!key || !key.P) return false;
53 var S = key.P.multiply(priv);
54 return Buffer.from(unstupid(S.getX().toBigInteger().toString(16),bytes*2),"hex");
55 }
56 }
57}
58
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